我看到了几种说法:
1. To do…, svo. 句型中的 Inf的逻辑主语与句子主语可一致也可不一致:
例如:To made stereo effects, two recordings are made the some performances. √
2.不定式放句首时,逻辑主语与句子主语要一致。
To save money, he has tried every means. √
To save money, every means has been tried. ×
上述两种说法矛盾。不知道真实的情况是如何呢?
另外:Therefore to increase the yield of the targeted reaction products, many factors are taken into consideration.这句话语法对不对呢?
你的问题句属于出现垂悬修饰语(dangling modifiers)的错误。根据语法规则,主句主语应该和修饰语中的主语一致才正确。根据《牛津英语语法指南》第四版115(4)词条的解释,对于垂悬修饰语,目前已经接受的是主句为形式主语或there be结构,或垂悬部分为习惯用语的情形,请看该书例句:
1. Being French, it's surprising that she's such a terrible cook.
2. Having so little time, there was not much that I could do.
3. Considering everything it wasn't a bad year.
以上用法都是正确的。
你的句子属于不定式结构,属于尚未认可的用法。国外一些网站的语法教学页面也有讲解,如:
http://www.biomedicaleditor.com/grammar-tip-dangling.html
Example
To investigate the relationship, a series of experiments were designed. (Incorrect)
(Who is going to investigate? Implied subject = we/researchers; grammatical subject = a series)
Correction:
We designed a series of experiments to investigate the relationship.
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https://www.niu.edu/writingtutorial/grammar/dangling-modifiers.shtml
Incorrect:
To see well, the lights in this room need to be adjusted.
Correct:
To see well, you must adjust the lights in this room.
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